Report a wrong number

Every number here comes from a maker's table, re-typed and re-checked by me, so some will still be wrong. Tell me which one and where the right one is, and I fix it in the catalogue. No account needed.

Adding a whole bike, or correcting a chart? Use Add or correct a bike

Bike: Mentech Chermin-R
Catalogue: 210 bikes · 43 makes · 1,262 sizes, from the makers' tables
What happens: I check the report against the maker's table myself and fix the catalogue when it's wrong; that usually takes a few days.
Sheet: 6 September 2026 · no account needed

The bike and the number

Bike

Mentech Chermin-R

Which number

What's wrong, and where the right number is

What's wrong, and what it should be

10 to 1000 characters. The size, the number as shown, and the number the maker gives.

Where the right number is (optional)

The maker's geometry page or chart. It makes the fix a two-minute job.

Your email (optional)

Only so I can tell you what I found. Nothing else, ever.

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